PLATE 7. 



Crassostrea lugardi, sp. nov. 



FlG. I. External view of lower valve bearing radial costae, the same example as depicted 

 on Plate 6, fig. I. 



Divaricella oppenheimi, sp. nov. 



FlG. 2. Exterior of a left valve, with angulate costae. x 2\. 



FlG. 3. Interior of another left valve showing hinge region and marginal dentations. 

 X 2j. 



Phacoides subrhomboidalis, sp. nov. 



FlG. 4. External view of right valve of example with closed valves. 



FlG. 5. Dorsal aspect of same, showing its compressed valves and narrow, elongate 

 ligament region. 



Cardium cf. obliquum, Lamarck. 

 FIG. 6. Umbonal aspect of specimen with closed valves. 



FlGS. 7 and 8. Interiors of opposing valves showing dentition and serrated margins. 

 FIG. 9. External view of a valve showing costal structure, x 2. 



Mactra semisulcata, Lamarck. 

 FIG. i o. Exterior of a left valve. 

 FlG. ii. Different view of same specimen, shortened in front to show the dorso-lateral 



compressions. 



FlG. 12. Interior of left valve of another example. 

 FlG. 13. Interior of right valve of a different individual. 



Corbula rugosa, Lamarck. 

 FlG. 14. View of specimen with closed valves. 

 FlG. 15. Another example with closed valves showing the inward umbonal curvature of 



the lower valve. 



FlG. 1 6. Outer view of another lower valve showing its strong concentric ridges. 

 FlG. 17. Inner view of a lower valve. 

 FlG. 1 8. Interior of an upper valve. 



